That nut who spends way to much on a escort.
i have a few crummy junk head lites I'll try some things like retro bright on.When you think about it, all kinds of things yellow with age: cloth, paper etc. and lightening them involves oxidizing agents like bleach and hydrogen peroxide, for instance.
If I try treating my lenses I will wait till next summer when they can dry out in the sun. It would take forever in our cold wet winter to dry them out.
The other option is to get an old pair cheap at the junkyard to experiment with.